package com.sky.service.impl;

import com.github.pagehelper.PageHelper;
import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @author: kjy
 * time: 2023/11/15 18:15
 * description:
 */

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;
    
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从 begin 到 end 范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while(!begin.equals(end)){
            // 日期计算，计算指定后一天的对应日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        String list = StringUtils.join(dateList, ",");

        // 存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            // 查询date日期对应的营业额数据（需要是已完成的订单）
            // select sum(amount) from orders where order_time > ? and order_time < ? and status = 5
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        // 封装返回结果
        return TurnoverReportVO.builder().
                dateList(list)
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从 begin 到 end 范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 存放每天新增的用户数/ 以及总的用户数
        List<Integer> newUserList = new ArrayList<>();
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);

            // 查询新增用户
            //新增用户数量 select count(id) from user where create_time > ? and create_time < ?
            Integer newUser = userMapper.getUserCount(beginTime,endTime);
            //总用户数量 select count(id) from user where  create_time < ?
            Integer totalUser = userMapper.getUserCount(null,endTime);

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    /**
     * 根据时间区间统计订单数量
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end){
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //每天订单总数集合
        List<Integer> orderCountList = new ArrayList<>();
        //每天有效订单数集合
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询每天的总订单数 select count(id) from orders where order_time > ? and order_time < ?
            Integer orderCount = orderMapper.getOrderCount(beginTime, endTime, null);

            //查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = ?
            Integer validOrderCount = orderMapper.getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //时间区间内的总订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //时间区间内的总有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();

    }


    /**
     * 查询指定时间区间内的销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        // 获取返回值 name的list并转为字符串
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        // 获取返回值 销量的list并转为字符串
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        // 封装并返回
        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        // 1.查询数据库，获取营业数据---查询最近30天数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        // 查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(
                LocalDateTime.of(dateBegin,LocalTime.MIN),
                LocalDateTime.of(dateEnd,LocalTime.MAX));


        // 2.通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            // 基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            // 获取表格文件sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            // 填充数据 -- 时间
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至"+dateEnd);

            // 获得第4行
            XSSFRow row = sheet.getRow(3);
            // 订单营业额
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            // 订单完成率
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            // 新增用户数
            row.getCell(4).setCellValue(businessDataVO.getNewUsers());

            // 获得第5行
            row = sheet.getRow(4);
            // 有效订单数
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            // 平均客单价
            row.getCell(2).setCellValue(businessDataVO.getUnitPrice());

            // 填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //准备明细数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                // 获取某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            // 3.通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            // 关闭资源
            out.flush();
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
